Piston jig



S e pt. 2 1924. 1,501,274

- R. E. CURTIS PI$TON JIG Filed June 9. 1923 A i i i/ /4 M )2 [b -Z 5 INVENTOR.

.63. gym,

7 ATTORNEY Patented Sept. 2, 1924.

UNITED STATES PATENT OFFICE.

ROSS n. CURTIS, or LINCOLN, KANSAS.

' PISTON JIG.

Application filed- J'une 9, 1923. Serial No. 644,418.

To all whom it may concern:

Be it known that I, Ross E. CURTIS, a citizen of the United States, residing at Lincoln, in thefcounty of Lincoln and State of Kansas, have invented new and useful Improvements in Piston Jigs, of which the following is a specification.

:gThis invention relates to a piston jig, oi device for use in holding a piston while removing and replacing bushings, reamingand alining set'bushings, and performing other similar work upon pistons of internal combustion engines and other similar pi.s-- tons.

One object of the invention is to provide a which will receive the piston and form a -firn1 support all around the piston, While piston bushings are being removed or applied, reamed or alined, thus protectmg the th n walls of the piston against any; possibility ofexcessive distortion or breakage vhile'work of the stated character; is being performed. i

Another object of the invention is to provide a which is positive in its action in holding a piston at right angles to the travel of a press arbor .o-r reamer, and parallel to the surface of the face plate on a press, so as to ensure perfect alinement with the press arbor or the production of a perfectly alined pair of bearings in reaming.

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to theaccompanying drawing, in which Figure 1 is a view, partly in side elevation and partly in section, of a piston enrbo'dving my invention.

Figure 2 is a vertical transverse section on the line 22 of Figure 1.

Figure 3 is a top plan view of the jig.

Figure 4 is a vertical longitudinal section through the jig, showing a piston fitted therein.

In carrying my invention into practice, I provide a piston jig 1 comprising a cast iron frame in the form of a cylindrical band adapted to receive and completely enclose a piston of a given size. This cylindrical band is open at each end and provided with a smooth turned internal surface 2 concentric with the horizontal center of t-he cylinder which is to be fitted therein. This surface 2 may be of a required radius to permit an over-sized piston to enter the ig, the construction described allowlng a piston to be entered or removed from either end of the jig, as will be readily understood' The cylinder or band 1 has a base portion 3 formed with a flat surface 4 designed to rest firmly and squarely upon a work bench or table. The surface 4. is parallel with the horizontal center of the ig and provided at opposite sides with extension flanges 5 having slots or notches 6 for the passage of bolts or other suitable fastenings whereby the ig may be secured to the work bench or table. Reinforcing webs 7 connect these flanges with the base portion of the cylinder wall 2, at the sides thereof, thus strengthening the jig cylinder so as to adapt it to effectually withstand'allpressures and strains falling thereon.

Formed in the top and bottom of the. cylinder 2, centrally thereof, are openings 8, arranged in axial alinement with each other andwith the vertical center. of the cylinder, which openings are provided for registry with the bushings and bushing openings of a piston fitted within the cylinder, thus exposing the bushings and, their receiving openings to permit the required work to be performed thereon.

In the practical use of the device, it is bolted or otherwise firmly secured to a bench or work table so that the horizontal axis of the cylinder 1 lies parallel with the surface of the work bench or table, the bottom opening 8 in the jig being arranged in alinement with a corresponding opening in the table below. The piston 9 to be operated upon may be inserted into the jig, as shown in Figure at, from either end thereof, and is brought into position so that the bushing receiving portion 10 and bushings 11 accurately register with the openings 8. Vhen the piston thus inserted, it is entirely surrounded by the band 2 and firmlv braced and sustained thereby, allowing old bushings to be driven out and new bushings driven in without liability: of straining, distorting or cracking the comparatively thin walls of the piston. IVhen the piston is so held it will be disposed parallel with the face plate of the press so as toallow the arbor of the press to come in accurate contact with the bushings. In the operation of removing old bushings, it will be understood that the bushings may be forced out of their receiving openings and discharged through the bottomiop'ening 8 and throughthe registering openingin the table or work bench. When the jig is so disposed, also, a piston contained therein will be held accurately at right angles to the travel of a reamer,

allowing the reaming operation to be carriedon so as to ensure a perfectly alined pair of bearings.

The band 1 may be longitudinally split at-oneside, as indicated at 12, so as to adapt it for expansion and contraction to receive pistons of varying sizes Within certain limits.

' Apertured lugs 13 are provided upon the to sma1ler' diameters Within given limits. This construction will allowiegular and oversize pistons of varying diameters, with in certain degrees, to be received and braced for the purposes described.

From the foregoing description, taken in connection with the' drawing, the construction and mode of operation of my improved piston jig will bereadily understood, and it Will be seen that a'device of'the character 3 described is provided which is simple of construction and adapted to effectually support and brace-the piston While bushings are being removed and replaced or being reamed or while other similar workis bein-g performed, thus allowing the workto'be carried on without liability of cracking or otherwise injuring the piston.

Having thus fully described my invention, I'claim': v

1. A piston jig for use in applying, removing and reaming piston bushings, said device comprising a body adapted to snugly embrace and sustain' the Walls of the'piston throughout the extent of the latter during bushing applying, removing and reaming operations, said .body having openings to aline with the bushing'receiving openings in the piston. f

2. A piston jig for use'in-Iappl'ying, removing'and reaming piston bushings, said device comprising a body having a circular Wall concentric with the axis of a piston to I beoperated'upon and adapted to surround and' snugly engage the outer walls'ot the piston-during bushing applying, removing and reaming operations, and having a sub-' stantially flat base approximately. parallel with the horizontalcenterof the surrounded piston, said body. being provided with alin ed openings in its top and base being in axial alinement with each other and with the vertical center of the body to register with the bushing receiving openings in the piston.

In'testimony whereof I aflix'my signature inpresence of a Witness. 2 p

v a F ROSS E; CURTIS. 1 WVitness: I Q W. M. WILSON. 

